X-ray-absorption spectroscopy study of the heavy-fermion superconductor PrOs 4 Sb

X-ray-absorption fine-structure ~XAFS! measurements have been carried out at the Pr L III and OsL III edges on the Pr-based heavy-fermion superconductor PrOs 4Sb12. The x-ray absorption near-edge structure results suggest that the Pr valence is very close to 3 1 with at most a small amount of Pr 41 @vPr;3.019(3)#, while Os is close to metallic in this… (More)